EP0869689A2 - Système de communication pour des appels de secours - Google Patents

Système de communication pour des appels de secours Download PDF

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Publication number
EP0869689A2
EP0869689A2 EP98105672A EP98105672A EP0869689A2 EP 0869689 A2 EP0869689 A2 EP 0869689A2 EP 98105672 A EP98105672 A EP 98105672A EP 98105672 A EP98105672 A EP 98105672A EP 0869689 A2 EP0869689 A2 EP 0869689A2
Authority
EP
European Patent Office
Prior art keywords
signal
emergency call
line
call
interval
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98105672A
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German (de)
English (en)
Other versions
EP0869689A3 (fr
Inventor
Tsutomu Kusaki
Yukiko Takeda
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Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0869689A2 publication Critical patent/EP0869689A2/fr
Publication of EP0869689A3 publication Critical patent/EP0869689A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/60—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to satellites or concentrators which connect one or more exchange lines with a group of local lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1309—Apparatus individually associated with a subscriber line, line circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13096—Digital apparatus individually associated with a subscriber line, digital line circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13098—Mobile subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13103—Memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13106—Microprocessor, CPU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13204—Protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13213—Counting, timing circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13216—Code signals, frame structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13298—Local loop systems, access network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13299—Bus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13353—Routing table, map memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1337—Operator, emergency services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13386—Line concentrator

Definitions

  • the invention relates to a communication system, a circuit transfer adapter, and a concentrator and, more particularly, to the improvement of a circuit control which enables a re-alerting at the time of an emergency call connection in a communication network in which a concentrating interval such as a digital circuit or the like is included in a partial interval of an analog subscriber line between a local switch (or subscriber switch) and a subscriber terminal.
  • a fixed telephone terminal
  • the line and the terminal correspond to each other in a one-to-one corresponding relation.
  • an emergency call from the subscriber terminal to a fire-police is also connected and communicated through the local switch.
  • a wireless local loop system for the purpose of reduction of a line installing time and decrease in installing costs by wireless concentrating parts of the conventional subscriber lines by using a wireless technique of a mobile communication system
  • a base station corresponding to the WLL system or a concentrator for concentrating the lines from the base station is connected to the local switch of the existing PSTN (Public Switched Telephone Network) and the subscriber terminal corresponding to the WLL system is connected to the base station through the wireless line. Consequently, the relation between the local switch and the subscriber terminal is similar to the relation between the local switch and the subscriber terminal connected by the conventional subscriber lines with respect to the ordinary communication.
  • PSTN Public Switched Telephone Network
  • the WLL system is a system in which parts of the lines are concentrated in a wireless state. It is desirable for preventing the subscriber from being aware of a difference from the existing system comprising only the analog subscriber lines. For this purpose, it is necessary to provide services and functions similar to those of the conventional system of only the analog subscriber lines.
  • the WLL system which is connected after the subscriber lines of the local switch is seen only as if the subscriber terminals of only the number as many as the number of subscriber lines were enclosed.
  • the local switch holds the line used for the emergency call even after the disconnection, there is the first problem such that, as for the holding, only the line up to the portion of the existing analog circuits which are directly connected to the local switch can be held.
  • Another object of the invention is to provide a communication system, a concentrator, and a circuit transfer adapter, in which a re-alerting from an emergency call termination destination such as a fire-police or the like is transmitted to a subscriber terminal in a manner similar to a conventional subscriber line, thereby realizing a restart of a communication.
  • Still another object of the invention is to provide a communication system, a concentrator, and a circuit transfer adapter, in which when an emergency call communication is finished, if a subscriber terminal again off-hooks, a restart of a communication with a termination destination is realized.
  • Another object of the invention is to provide a communication system for efficiently using the subscriber line when the communication is restarted.
  • a communication system comprising: subscriber terminals each of which is identified by an identification number of the subscriber terminal and transmits a communication partner number at the time of call origination; a concentrator including first analog circuit ports which enclose the n (n is a natural number) subscriber terminals, first digital circuit ports for connecting m (m is a natural number: n > m) digital circuits, and first circuit assigning means for, when there is a call origination from the subscriber terminal, assigning the first digital circuit port which is not used for communication to the subscriber terminal which performed the call origination; and a circuit transfer adapter having m second digital circuit ports which construct pairs together with the first digital circuit ports provided for the concentrator, second analog circuit ports having k (k is a natural number: k ⁇ n) analog circuits which construct pairs together with the first analog circuit ports, and second circuit assigning means for converting information which is inputted to the second digital circuit port into the second analog circuit port and outputting, wherein
  • the origination subscriber terminal regarding the emergency call is called through the second digital circuit port held by the holding means.
  • the emergency call when the origination signal is received from the first analog circuit port regarding the emergency call while the second digital circuit is held, the emergency call is re-connected through the first digital circuit port used at the time of the call origination of the emergency call and the second digital circuit port held by the holding means.
  • a circuit transfer adapter comprising: digital circuit ports which enclose m (m is a natural number) digital circuits; analog circuit ports which enclose k (k is a natural number: k > m) analog circuits and transmit information from the digital circuit ports; a control circuit port for transmitting control information of the digital circuit port; call control means for assigning the digital circuit port which is designated by a control signal to any one of the analog circuit ports and controlling on the basis of a control signal which is received through the control circuit port; a circuit management table for storing the digital circuit ports assigned by the call control means, the analog circuit ports, and using states of the digital circuit ports; and holding means for holding the digital circuit port regarding an emergency call after the emergency call was disconnected in the case where a signal to request a call origination of the emergency call is transmitted as such a control signal, wherein while the digital circuit port regarding the emergency call is held by the holding means, a message indicating an emergency call holding is stored as a using state of the
  • the call control means when the call control means receives a call signal from the analog circuit port while the digital circuit port is held by the holding means, the call control means retrieves the circuit management table on the basis of the analog circuit port which received the call signal and, when the using state of the digital circuit port corresponding to the analog circuit port indicates the emergency call holding, an emergency call re-alerting signal is outputted as such a control signal to the control circuit port.
  • the call control means when the call control means receives an emergency call re-connect signal from the control circuit port while the digital circuit port is held by the holding means, the call control means retrieves the circuit management table on the basis of the digital circuit port regarding the emergency call re-connect signal, and in the case where the using state of the digital circuit port indicates an emergency call holding, the call control means connects the analog circuit port corresponding to the digital circuit and opens the analog circuit port.
  • a concentrator comprising: analog circuit ports which enclose n (n is a natural number) subscriber terminals; digital circuit ports for connecting m (m is a natural number: n > m) digital circuits on the network side and transmitting information from the analog circuit ports; a control circuit port for transmitting control information of the digital circuit port; and call control means for, when there is a call origination from any one of the analog circuit ports, assigning the digital circuit port which is not used for a communication to the analog circuit port which performed the call origination, wherein when the call origination is an emergency call, if a disconnection of the emergency call is detected from the analog circuit port regarding the emergency call, the call control means outputs an emergency call disconnect signal to the control circuit port.
  • the call control means when an emergency call re-alerting signal is received through the control circuit port, the call control means calls the subscriber terminal to be called through the second analog circuit port on the basis of the emergency call re-alerting signal.
  • the call control means when a connect signal is received through the analog circuit port regarding the emergency call, the call control means transmits an emergency call re-connect signal through the control circuit port and re-connects the emergency call through the digital circuit port used at the time of the communication of the emergency call.
  • a communication network system including, for example, a local switch, an adapter apparatus which is connected by circuits of the number as many as the number of subscribers which are accommodated under the domination of the local switch, a concentrator which is connected through a concentrating interval under the domination of the adapter apparatus, and subscriber terminals each thereof being connected with each circuit under the domination of the concentrator, wherein the adapter apparatus comprises: means which has a timer that is activated only for a predetermined time when an emergency call disconnect signal (signal to notify that the circuit between the subscriber terminal and the node was disconnected by the subscriber from a state of the emergency call communication in progress) which is transmitted from the concentrator is received and which is used for holding the circuit used for the emergency call communication so far between such means and the dominant concentrator during the activation of the timer and restricting the use of another call; means for, when a call signal (re-alerting signal) is received from the local switch during the activation of
  • an emergency call disconnect signal signal to notify that the circuit between the subscriber terminal
  • the communication network system having the means as mentioned above, in the case where the conventional local switch and the subscriber terminal are directly connected by a re-alerting from the emergency call connection destination or an off-hook of the subscriber terminal just after the end of the emergency call communication, in a manner similar to that the communication can be restarted among the call connection destination, the local switch, and the subscriber terminal, a speech path is reset among the emergency call connection destination, the local switch, the adapter apparatus, the concentrator, and the subscriber terminal, and the communication can be restarted.
  • a re-alerting from the emergency call termination destination (fire-police or the like) or a re-connect corresponding to the re-alerting just after the end of the emergency call provided in the conventional analog subscriber line between the local switch and the subscriber terminal can be performed by specifying the subscriber and can be certainly executed.
  • Fig. 1 shows a schematic construction of a communication network system 10 to which the invention is applied.
  • the network system 10 encloses a plurality of subscriber terminals 400.
  • a node 3 (300) is connected to the subscriber terminals 400 through a plurality of analog subscriber lines (it is assumed that the sum of all of the subscriber lines which are finally connected to a node 2 is equal to n) 350, respectively.
  • the analog subscriber lines 350 are connected to the subscriber terminals 400 in a one-to-one corresponding relation.
  • a communication node 2 (200) is connected to the communication node 3 (300) through a plurality of digital subscriber lines (it is assumed that the sum of all of digital circuits which are finally connected to the node 2 is equal to m) 250, respectively.
  • Each of the digital subscriber lines 250 has one or a plurality of channels.
  • a node 1 (100) is connected to the node 2 (200) through a plurality (k lines) of analog subscriber lines 150.
  • analog subscriber lines 150 the lines of the number which is equal to or less than the total number of subscriber terminals 400 which are enclosed (connected) under the domination of the node 2 (200) which is connected are provided.
  • the node 1 (100) also connects a subscriber terminal 400a through an analog subscriber line 160.
  • the node 1 (100) is connected to a fire-police 500 through a dedicated line (or subscriber line) 550 or, further, via a line in the PSTN.
  • the dedicated line (or subscriber line) 550 is connected to a terminal which is installed in the fire-police 500.
  • the node 1 (100) is a node in one of PSTNs 1000.
  • a total number k of lines of the analog subscriber lines 150, the total number n of lines of the analog subscriber lines 350, and the total number m of channels of the digital subscriber lines 250 generally have the relation of ( n ⁇ k > m ).
  • a call origination from a certain subscriber terminal 400 is transferred to the terminal on the termination side through the node 3 (300), node 2 (200), node 1 (100), and PSTN 1000 (or another network (not shown) which is connected to the PSTN 1000), a connecting request is performed, and a communication is started between the subscriber terminal and the terminal on the termination side.
  • a connecting request is transmitted to the node 1 (100) from the origination side terminal (or origination side terminal which is enclosed in another network which is connected to the PSTN 1000) which is enclosed in the PSTN 1000 and is, further, transferred to the node 2 (200) and node 3 (300).
  • the call is terminated to the subscriber terminal 400 and the communication is started.
  • the call origination from the subscriber terminal 400 to the fire-police 500 is performed in the case where the termination destination in the above call origination is the fire-police 500.
  • Fig. 2 shows an internal construction of the node 2 (200).
  • the node 2 is constructed by: an analog circuit interface control unit (analog circuit port) 212 for performing an interface control for the node 1 (100); a digital circuit interface control unit (digital circuit port) 213 for performing an interface control for the node 3 (300); a switch 211 for performing a circuit switching; a circuit control unit 215 for performing a circuit switching control and a control of each control unit; and a bus 214 for performing a transfer of signals and data between the control units.
  • the circuit control unit 215 is constructed by: a CPU 216 for executing each process and arithmetic operation; and a memory 220 for holding each processing program (an emergency call processing program is also included), information, and data.
  • Reference numeral 217 denotes a control circuit port contained in the digital circuit interface control unit 213. Further, an emergency call processing program 222 for executing an emergency call process, a general call processing program 221 for performing a general call process other than the emergency call process, and an apparatus control program 224 for controlling each control unit in the node 2 (200) have been stored in the memory 220.
  • the memory 220 also includes a region of a channel management table 225 to hold subscriber information, circuit idle/busy information, and circuit connection information which are necessary for a circuit connection.
  • the emergency call processing program 222 is made up of a portion 223 to perform a connecting process of an emergency call and a portion 230 to perform a realerting process of the emergency call.
  • the node 2 (200) encloses a plurality of nodes 3 (300) under the domination and each of the analog subscriber lines 150 corresponds to each of the subscriber terminals 400 which are enclosed under the domination of the node 2 (200) in a one-to-one corresponding relation
  • subscriber information for example, telephone numbers
  • information for example, apparatus numbers or the numbers of the lines which are connected
  • information for instance, the line number or port number
  • the analog circuit interface control unit 212 shows its function for the node 1 (100) in a manner similar to the case where the fixed terminals 400 are connected.
  • a control for reading out the information in the memory 220 on the basis of the origination subscriber information (for example, origination number) transferred through the digital subscriber line 250 and selecting the analog line 150 on the connection destination side is executed by the circuit control unit 215.
  • the information in the memory 220 is read out on the basis of the information of the analog subscriber line 150 to which the call was terminated and the digital subscriber line 250 (node 3) on the connection destination side is selected.
  • a control channel of the control circuit port 217 transmits and receives the control information to/from the node 3 (300), with being multiplexed on the digital subscriber line 250.
  • Fig. 3 shows an internal construction of the node 3 (300).
  • the node 3 (300) is constructed by: an analog circuit interface control unit (analog circuit port) 323 for performing an interface control for the subscriber terminals; a digital circuit interface control unit (digital circuit port) 322 for performing an interface control for the node 2 (200); a switch for concentration 321 to concentrate the analog subscriber lines 350 to the digital subscriber lines 250; a circuit control unit 327 for performing a control of each control unit; and a bus 324 for transferring signals and data between the control units. Further, the circuit control unit 327 is constructed by: a CPU 326 to execute each process and arithmetic operation; and a memory 328 to hold each processing program, information, and data.
  • the analog circuit interface control unit 323 shows its function for the subscriber terminals 400 in a manner similar to the case where the node 1 (100) is connected.
  • the nodes 2 and 3 mutually transmit information to control the digital lines 250 to control circuit ports 217 and 317, respectively.
  • the control channel is used for the transmission. For example, if a digital circuit connecting the nodes 2 and 3 is the ISDN (Integrated Services Digital Network), a D channel is used as a control channel.
  • the node 3 performs the concentrating function.
  • the CPU 326 grasps the identification number of the call origination subscriber terminal from the line number of the analog line 350 to which the call origination was performed and transmits the ID number to the node 2 as an origination request signal through the control channel 218.
  • the CPU monitors the emergency call. When a disconnection of the emergency call is detected, the CPU notifies the node 2 of an emergency call disconnect signal through the control channel.
  • Fig. 4 shows a procedure of the emergency call re-alerting process 230 in the node 2 (200) and relates to the most characteristic portion of the invention.
  • step 232 it is not necessary to determine whether the communication is an emergency call communication in progress or not. Therefore, whether the emergency call disconnect signal from the digital subscriber line 250 side has been received or not is always monitored (step 232).
  • step 233 When it is received, namely, when a signal showing that the subscriber terminal 400 (subscriber) disconnects the analog subscriber line 350 by the on-hook is transmitted through the node 3 (300) and digital subscriber line 250, the analog subscriber line 150 which has been connected so far for the emergency call communication is disconnected (step 233).
  • a process to open a DC loop corresponds to step 233.
  • a digital subscriber circuit holding timer 850 is activated (step 234).
  • the digital line (channel) is held without disconnecting the digital subscriber line 250 (one channel in this line) which has been connected so far for the emergency call communication and without being used for another call.
  • a call signal is received (step 235) from the analog line disconnected by the analog line disconnecting process (step 233), namely, when a re-alerting request is received from the fire-police 500
  • an emergency call re-alerting signal for the subscriber terminal 400 which was emergency call disconnected in the above process is transmitted (step 240).
  • This signal is a signal for notifying the subscriber terminal 400 (subscriber) of a fact that the re-alerting was requested from the fire-police 500.
  • the emergency call re-alerting signal was transmitted, when an emergency call re-connect signal is received from the digital subscriber line side (step 241), the digital circuit holding timer 850 is stopped (step 239). The digital line 250 side is shifted to a communicable state. After that, a connect signal is transmitted to the analog subscriber line (namely, fire-police 500) which received the call signal in the above process (step 242).
  • the emergency call re-alerting signal is a signal to notify that the subscriber responded to a re-alerting request to the subscriber terminal 400 (subscriber) by the emergency call re-alerting signal.
  • an emergency call re-connect signal for the digital line (channel) in holding is received (step 236) from the digital line side without receiving the call signal (NO in step 235) from the analog line disconnected by the analog line disconnecting process (step 233) will now be described. That is, when a fact that the analog subscriber line 350 was shifted to the communicable state or that a communication restarting request was generated from the subscriber is notified to the node 2 (200) via the node 3 (300) and digital subscriber line 250 by the off-hook indicative of the communication restarting request by the subscriber terminal 400 (subscriber), the digital circuit holding timer 850 is stopped (step 243).
  • the digital line side is shifted to the communicable state. After that, a connect signal is transmitted (step 244) to the analog subscriber line disconnected in the above process.
  • the communication which has once been interrupted by the disconnection from the subscriber terminal 400 in step 232 is restarted (step 231) by the transmitting process (step 244) of the connect signal.
  • step 234 After the digital circuit holding timer 850 was activated in step 234, when the timer 850 times out (YES in step 237) without receiving the call signal (NO in step 235) from the analog line disconnected in the analog line disconnecting process (step 233) and without receiving the emergency call re-connect signal to the digital line (channel) in holding from the digital line side (NO in step 236), a disconnecting and releasing process of the holding digital line (channel) is executed (step 238).
  • the emergency call re-alerting process 230 is finished (step 249).
  • Fig. 5 shows a processing sequence until the subscriber responds to the re-alerting from the fire-police 500 and the communication is restarted after the end of the emergency call communication from the subscriber to the fire-police 500.
  • a circuit between the subscriber terminal 400 and the fire-police 500 enters a communication in progress 990 through the nodes 3, 2, and 1 and the PSTN 1000.
  • the subscriber terminal 400 in the emergency call communication in progress When the subscriber terminal 400 in the emergency call communication in progress is on-hooked by the subscriber (user), the subscriber terminal 400 transmits a disconnect signal 903 to the node 3 (300) in a manner similar to the case of the end of the ordinary communication.
  • the disconnect signal 903 is transferred by opening the DC loop in the case where the analog subscriber line 350 is an analog subscriber line of the double-line type.
  • the node 3 (300) which received the disconnect signal 903 in the emergency call communication in progress transmits an emergency call disconnect signal 803 to the node 2 (200) from the information regarding, for instance, the connection destination of the emergency call.
  • the emergency call disconnect signal is transmitted as a signal message or an information element in the signal message on the signal line of the digital subscriber line 250 and notifies the node 2 (200) of a fact that the analog subscriber line 350 side was disconnected in the emergency call communication in progress.
  • the node 2 (200) in which the emergency call re-alerting process (step 230) is activating transmits a disconnect signal to the node 1 (100), thereby disconnecting and releasing the circuit connection to the node 1 (100).
  • the disconnect signal 703 is a signal similar to the disconnect signal 903. That is, when seeing from the node 1, the disconnect signal 903 is seen as if it was transmitted from the subscriber terminal 400.
  • the node 2 (200) activates the digital circuit holding timer 850 and holds the digital subscriber line (channel) 350 used so far for the emergency call communication without disconnecting and releasing and starts to prevent the line (channel) from being used for another call (step 234).
  • the node 1 (100) which received the disconnect signal 703 transmits a busy tone 611 to the fire-police 500 and generates an emergency call, thereby notifying that the line was disconnected from the subscriber which has performed the communication so far.
  • the fire-police 500 When re-alerting to the subscriber who disconnected the emergency call, the fire-police 500 transmits a re-ringing request signal 601 to the node 1 (100).
  • the node 1 (100) which received the re-ringing request signal 601 transmits a call signal 701 to the subscriber who disconnected the emergency call.
  • a call signal 701 which is transmitted from the node 1 (100) a signal similar to the call signal which is transmitted to the subscriber terminal 400 directly connected to the node 1 (100) is transmitted.
  • the node 2 (200) which received the call signal 701 from the node 1 (100) during the activation of the digital circuit holding timer 850 transmits an emergency call re-alerting signal 801 as a signal message or an information element in the signal message onto the signal line (channel) of the holding digital subscriber line 250.
  • the emergency call re-alerting signal 801 is a signal to notify the subscriber who has performed the emergency call communication so far of a fact that the re-alerting was executed from the fire-police 500.
  • the node 3 (300) which received the emergency call re-alerting signal 801 transmits a call signal 901 to the subscriber terminal 400, thereby re-alerting to the subscriber.
  • the call signal 901 is a signal similar to the call signal 701.
  • the subscriber terminal 400 which received the call signal 901 rings, thereby notifying the user of the presence of a call.
  • the subscriber terminal 400 transmits a connect signal 902 to the node 3 (300).
  • the connect signal 902 is transmitted by closing the DC loop in the case where the analog subscriber line 350 is an analog subscriber line of the double-line type.
  • the node 3 (300) which received the connect signal 902 transmits an emergency call re-connect signal 802 to the node 2 (200).
  • the emergency call re-connect signal is transmitted as a signal message or an information element in the signal message on the signal line of the digital subscriber line, thereby notifying the node 2 (200) of a fact that the analog subscriber line 350 side was connected.
  • the node 2 stops the digital circuit holding timer 805 (step 239) and transmits a connect signal 702 to the node 1 (100), thereby connecting the line to the node 1 (100).
  • the connect signal 702 is a signal similar to the connect signal 902.
  • the node 1 (100) which received the connect signal 702 transmits a connect signal 602 to the fire-police 500 and restarts the emergency call communication 990 with the subscriber who requested the re-alerting.
  • Fig. 6 shows a processing sequence until the subscriber who once finished (on-hooked) the emergency call communication restarts the communication just after the on-hook.
  • a sequence from the on-hook in the subscriber terminal 400 to a time point until the busy tone 611 is transmitted to the fire-police 500 is similar to the foregoing sequence shown in Fig. 5 and associated to Fig. 5.
  • the subscriber terminal 400 transmits an origination signal 904 to the node 3 (300) and connects the line to the node 3 (300).
  • the origination signal 904 is transferred by closing the DC loop in the case where the analog subscriber line 350 is an analog subscriber line of the double-line type.
  • the origination signal 904 is electrically similar to the connect signal 902.
  • the node 3 (300) which receives the origination signal 904 from the subscriber terminal 400 just after the emergency call disconnect signal 803 was transmitted transmits the emergency call re-connect signal 802 to the node 2 (200).
  • the origination signal 704 is a signal similar to the origination signal 904.
  • Fig. 7 shows a processing sequence for disconnecting and releasing the line held for the emergency call re-alerting.
  • a sequence from the on-hook in the subscriber terminal 400 to a time point until the busy tone is transferred to the fire-police 500 is similar to the foregoing sequence shown in Fig. 5 and associated with Fig. 5.
  • the digital circuit holding timer 850 times out (237), for instance, in case of using the ISDN, by transmitting and receiving a disconnect message 821 for the node 3 (300), a release message 822, and a release complete message 823, the digital subscriber line (channel) 350 held so far is disconnected and released.
  • Fig. 8 shows an example of a signal (message) format of the emergency call disconnect signal 803 which is transmitted from the node 3 (300) to the node 2 (200) in the processing sequences of Figs. 5, 6, and 7 mentioned above.
  • the emergency call disconnect signal 803 even if it is transmitted and received, since interface states of the node 2 (200) and node 3 (300) do not change ("communication in progress" is continued), in case of using a UNI message of the ISDN, an additional information message is used to transmit the emergency call disconnect signal 803.
  • An internal construction of the additional information message which is used for transfer of the emergency call disconnect signal 803 includes: a protocol identifier 851 which is determined by the standard recommendation; a call reference 852; a message type 853; and an emergency call disconnect signal information element 854 to indicate (instruct) the transfer of the emergency call disconnect signal 803.
  • the emergency call disconnect signal information element 854 is made up of only an information element identifier 861 in order to show the transmission of the emergency call disconnect signal 803 by itself.
  • Fig. 9 shows an example of a signal (message) format of the emergency call re-alerting signal 801 which is transmitted from the node 2 (200) to the node 3 (300) in the processing sequence in Fig. 5.
  • the emergency call re-alerting signal 801 even if it is transmitted and received, since interface states of the node 2 (200) and node 3 (300) do not change ("communication in progress" is continued), in case of using a UNI message of the ISDN, the additional information message is used to transmit the emergency call re-alerting signal 801.
  • An internal construction of the additional information message which is used for transfer of the emergency call re-alerting signal 801 includes: the protocol identifier 851 which is determined by the standard recommendation; call reference 852; message type 853; and an emergency call re-alerting signal information element 855 to indicate (instruct) the transfer of the emergency call re-alerting signal 801.
  • the emergency call re-alerting signal information element 855 is constructed by an information element identifier 862, a type 864 of re-alerting signal 801, and a length 863 of contents indicative of the number of octets after the re-alerting signal 801.
  • Fig. 10 shows an example of a signal (message) format of the emergency call re-connect signal 802 which is transmitted from the node 3 (300) to the node 2 (200) in the processing sequence in Fig. 5 or Fig. 6.
  • the emergency call re-connect signal 802 even if it is transmitted and received, since interface states of the node 2 (200) and node 3 (300) do not change ("communication in progress" is continued), in case of using a UNI message of the ISDN, an additional information message is used to transmit the emergency call re-connect signal 802.
  • An internal construction of the additional information message which is used for transfer of the emergency call re-connect signal 802 includes: the protocol identifier 851 which is determined by the standard recommendation; call reference 852; message type 853; and an emergency call re-connect signal information element 856 to indicate (instruct) the transfer of the emergency call re-connect signal 802.
  • the emergency call re-connect signal information element 856 is constructed by an information element identifier 865 to show the transfer of the emergency call reconnect signal 802, a re-connect signal type 867 showing a format (transfer by a polarity inversion or the like) of the emergency call re-connect signal in the analog subscriber line 150, and a length 866 of contents indicative of an information length of the re-connect signal type 863.
  • Fig. 11 shows a specific construction of the communication network system 10 shown in Fig. 1.
  • This network encloses a plurality of fixed terminals 401.
  • the fixed terminal 401 is an example of the fixed terminals 400 shown in Fig. 1.
  • a wireless subscriber unit 320 is connected to one or a plurality of fixed terminals 401 through analog subscriber lines 351.
  • the wireless subscriber unit 320 is an example of the node 3 (300) shown in Fig. 1.
  • a base station 310 is connected to one or a plurality of wireless subscriber units 320 through wireless digital subscriber lines 253.
  • a digital/analog circuit transfer adapter 201 is connected to one or a plurality of base stations 310 through digital subscriber lines 251.
  • the digital/analog circuit transfer adapter 201 is an example of the node 2 (200) shown in Fig. 1.
  • the digital/analog circuit transfer adapter 201 is, for instance, an apparatus having a switching function such as local switch, MSC (Mobile Switching Center), PBX, or BSC (Base Station Controller).
  • the digital subscriber line 251 and wireless digital subscriber line 253 as well as the base station 310 are examples of the digital subscriber line 250 shown in Fig. 1.
  • a local switch (or subscriber switch) 101 is connected to one or a plurality of digital/analog circuit transfer adapters 201 through subscriber lines 151.
  • the local switch 101 is an example of the node 1 (100) shown in Fig. 1.
  • the subscriber line 151 is an example of the analog subscriber line 150 shown in Fig. 1.
  • a concentrator 330 is connected to one or a plurality of fixed terminals 401 through analog subscriber lines 352.
  • the concentrator 330 is an example of the node 3 (300) shown in Fig. 1. Further, specifically speaking, for example, the concentrator 330 is an apparatus having an exchange/concentrating function such as a PBX.
  • the concentrator 330 is connected to the digital/analog circuit transfer adapter 201 through the digital subscriber line 252. There is also an existing connection format such that the fixed terminals 401 are connected to the local switch 101 through analog subscriber lines 161.
  • Fig. 12 shows an example of a channel management table 225 constructed in the memory 220 in the node 2 (200) shown in Fig. 2.
  • the channel management table 225 is a table for managing the relation between the analog subscriber lines 150 which are being used at the time of the line connection and the channels of the digital subscriber lines 250 which are connected to the analog subscriber lines 150 and for managing using situations (states) of the channels of the digital subscriber lines 250.
  • the channel management table 225 includes: a column 1211 to store the numbers of the analog subscriber lines 150; a column 1212 to store the subscriber ID numbers of the subscriber terminals 400; a column 1213 to store the channel numbers of the digital subscriber lines 250; and a column 1214 to store the channel states of the digital lines 250.
  • the subscriber ID number (for example, telephone number) 1212 of the subscriber terminal 400 is transferred to the node 2 through the control channel together with a message to request a call connection and the analog subscriber line 150 corresponding to the subscriber ID number is selected by referring to the channel management table 225.
  • a speech path is set by connecting the selected analog subscriber line 150 and a specific channel of the digital subscriber line 250 selected by an instruction included in the message to request the call connection or by the judgment of the node 2.
  • the digital line which is not used is mainly selectively assigned.
  • the channel number of the selected digital subscriber line and the channel state of the digital subscriber line are stored into the columns 1213 and 1214 of the channel management table 225 in correspondence to the line number of the analog subscriber line 150 of the column 1211 and the subscriber ID number of the column 1212, respectively.
  • the execution of the table management of the digital lines (concentrating intervals) which are used is useful at the time of the re-alerting or connection of the emergency call.
  • the analog subscriber line 150 side When the analog subscriber line 150 side is again connected (when the emergency call re-connect signal 802 is received) from the emergency call holding state, if a result obtained by retrieving the number of the digital line which issued the re-connect signal indicates the digital line number in the emergency call holding on the channel management table 225, the analog subscriber line number registered in the table as a set together with the digital line number can be extracted. Therefore, the analog subscriber line 150 on the re-connection destination side can be unconditionally selected.
  • Fig. 13 shows an example of a channel management table upon reception of the emergency call disconnect signal as one of accessing processes to the channel management table 225 shown in Fig. 12 in the flow of the emergency call re-alerting process 230 in the node 2 shown in Fig. 4.
  • This process is activated when the emergency call disconnect signal 803 is received (step 232) in the emergency call re-alerting process 230.
  • the emergency call disconnect signal 803 is received, the channel number in the digital line concerned with this signal is recognized (step 261). The number which coincides with the channel number is retrieved in the column 1213 of "digital circuit channel number" in the channel management table 225, thereby extracting a row 1215 including such a number.
  • a "digital circuit channel state" value 1216 of the channel number included in the same row is rewritten from "communication in progress" to "emergency call holding" (step 262).
  • “analog subscriber line number” 1217 which belongs to the same row is extracted (step 263). A loop of the analog line (“2") having the extracted analog subscriber line number 1217 is opened and this analog subscriber line is disconnected (step 233).
  • the corresponding analog subscriber line 150 is released while holding the digital circuit channel 250.
  • Fig. 14 shows an example of a channel management table process upon reception of the call signal as one of the accessing processes to the channel management table 225 shown in Fig. 12 in the flow of the emergency call re-alerting process 230 in the node 2 shown in Fig. 4.
  • This process is activated when the call signal 701 is received (YES in step 235) in the emergency call re-alerting process 230.
  • the call signal 701 is received, the number of the analog subscriber line 150 which received this signal is recognized (step 264). The number which coincides with the recognized line number is retrieved in the "analog subscriber line number" column 1211 on the channel management table 225, thereby extracting the row 1215 including this line number.
  • the value of the "digital circuit channel state" 1216 included in the same row is confirmed (step 265).
  • the ordinary terminating process step 267) is activated.
  • a "digital circuit channel number" 1218 which belongs to the same row is similarly extracted (step 266).
  • the emergency call re-alerting signal 801 for the digital circuit channel ("13") having the extracted digital circuit channel number is transmitted (step 240).
  • the call signal 701 received from the analog subscriber line 150 side can be transmitted to the node 3 through the digital line 250.
  • Fig. 15 shows a channel management table process upon reception of the emergency call re-connect signal as one of the accessing processes to the channel management table 225 shown in Fig. 12 in the flow of the emergency call re-alerting process 230 in the node 2 shown in Fig. 4.
  • This process is activated after the emergency call re-connect signal 802 was received (step 241) and the digital circuit holding timer was stopped (step 239) in the emergency call re-alerting process 230.
  • the emergency call re-connect signal 802 is received, the channel number in the digital line concerned with the signal 801 is recognized (step 267). The number which coincides with the channel number is retrieved in the "digital circuit channel number" column 1213 on the channel management table 225, thereby extracting the row 1215 including this number. The "analog subscriber line number" 1217 included in this row is extracted (step 268). A loop of the analog line having the extracted analog subscriber line number is closed and the connect signal 702 is transmitted (step 242).
  • the connect signal (emergency call re-connect signal) received from the subscriber terminal 400 through the node 3 is transferred to the node 1 through the analog subscriber line 150 and the re-connection of the call is realized.
  • Fig. 16 shows an example of a specific bit coding of the emergency call disconnect signal information element 854 shown in Fig. 8.
  • the emergency call disconnect signal information element 854 is disclosed in accordance with a bit coding rule similar to the information element which is specified by the ITU-T (International Telecommunication Union) Recommendation Q.931, since the present information element is a single octet information element, bits such that bit 8 is set to "1" and this information element is specified by the other seven bits are assigned to the field 861 of the information element identifier (first octet) of the emergency call disconnect signal information element 854. In another case where it is necessary to add information, it is specified after the second octet. In this case, however, bit 8 of the first octet is equal to "0".
  • the emergency call disconnect signal information element 854 is not specified by the ITU-T Recommendation, it cannot be used in the code group 0 (ITU-T Q.931 information element) and is used as an information element (information element that is peculiar to a public network or a private network) of another code group, for example, a code group 6.
  • Fig. 17 shows an example of a specific bit coding of the re-alerting signal information element 855 shown in Fig. 9.
  • the re-alerting signal information element 855 is disclosed in accordance with a bit coding rule similar to the information element which is specified by the ITU-T Recommendation Q.931, since the present information element is a plural octet information element, bits such that bit 8 is set to "0" and this information element is specified by the other seven bits are assigned to the field 862 of the information element identifier (first octet) of the re-alerting signal information element 855.
  • the second octet is the field 863 showing a length of contents of the present information element and, in case of the information element, specifically speaking, since the content length of the third octet or less is equal to 1, a bit coding is set to "00000001".
  • the third octet is the field 864 showing a type of the re-alerting signal and indicates the type of the call in holding for performing the re-alerting. Specifically speaking, "re-alerting upon general call holding" and "re-alerting upon emergency call holding" can be selected. In the case where the present information element is included in the emergency call re-alerting message and is used, the present octet is used as "re-alerting upon emergency call holding" "00000001".
  • Fig. 18 shows an example of a specific bit coding of the re-connect signal information element 856 shown in Fig. 10.
  • the re-connect signal information element 856 is disclosed in accordance with a bit coding rule similar to the information element which is specified by the ITU-T Recommendation Q.931, since the present information element is a plural octet information element, bits such that bit 8 is set to "0" and this information element is specified by the other seven bits are assigned to the field 865 of the information element identifier (first octet) of the re-connect signal information element 856.
  • the second octet is the field 866 showing a length of contents of the present information element and, in case of the information element, specifically speaking, since the content length of the third octet or less is equal to 1, a bit coding is set to "00000001".
  • the third octet is the field 867 showing a type of the re-connect signal and indicates the electrical state in case of transmitting this signal by the analog subscriber line of the double-line type. Specifically speaking, when bit 1 is set equal to "0”, “normal” (polarity of default) is set. When bit 1 is equal to “1”, “reverse” (polarity is inverted) is set.

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Alarm Systems (AREA)
EP98105672A 1997-03-31 1998-03-27 Système de communication pour des appels de secours Withdrawn EP0869689A3 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP7957497 1997-03-31
JP79574/97 1997-03-31
JP7957497A JPH10276459A (ja) 1997-03-31 1997-03-31 通信システム、回線変換アダプタ及び集線装置

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EP0869689A2 true EP0869689A2 (fr) 1998-10-07
EP0869689A3 EP0869689A3 (fr) 2001-03-07

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CN103430521B (zh) * 2011-03-17 2016-01-20 富士通株式会社 线路连接装置、线路连接方法
RU2674749C1 (ru) * 2017-10-16 2018-12-13 Федеральное государственное бюджетное учреждение "16 Центральный научно-исследовательский испытательный ордена Красной Звезды институт имени маршала войск связи А.И. Белова" Министерства обороны Российской Федерации Концентратор телефонной связи

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0304955A2 (fr) * 1987-08-27 1989-03-01 Nec Corporation Système de concentrateur radio capable d'établir des appels d'urgence lors de saturation de trafic
WO1996031015A1 (fr) * 1995-03-31 1996-10-03 Motorola Inc. Procede et appareil pour allouer des ressources de communication pour assurer des communications prioritaires dans un systeme de communication
JPH09205667A (ja) * 1996-01-24 1997-08-05 Nippon Telegr & Teleph Corp <Ntt> 移動通信方式および緊急通信呼び返し方法

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0304955A2 (fr) * 1987-08-27 1989-03-01 Nec Corporation Système de concentrateur radio capable d'établir des appels d'urgence lors de saturation de trafic
WO1996031015A1 (fr) * 1995-03-31 1996-10-03 Motorola Inc. Procede et appareil pour allouer des ressources de communication pour assurer des communications prioritaires dans un systeme de communication
JPH09205667A (ja) * 1996-01-24 1997-08-05 Nippon Telegr & Teleph Corp <Ntt> 移動通信方式および緊急通信呼び返し方法

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Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 12, 25 December 1997 (1997-12-25) & JP 09 205667 A (NTT), 5 August 1997 (1997-08-05) *

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